--- a/progs/knight2_sol.scala	Tue Nov 15 23:08:09 2016 +0000
+++ b/progs/knight2_sol.scala	Wed Nov 16 14:37:18 2016 +0000
@@ -1,9 +1,8 @@
 // Part 2 about finding a single tour for a board
 //================================================
 
-
-type Pos = (Int, Int)
-type Path = List[Pos]
+type Pos = (Int, Int)    // a position on a chessboard 
+type Path = List[Pos]    // a path...a list of positions
 
 def print_board(dim: Int, path: Path): Unit = {
   println